Speed-adjuster for motion-picture machines.



W. P. KUBITZ & G. SGHMIDBORN. SPEED ADJUSTER FOR MOTION PICTUREMACHINES.

APPLICATION FILED JULY 29, 1913.

1,128,460. Patented Feb. 16, 1915.

2 SHEETSfSHEET 1.

attomw W. P. KUBITZ 9: 0. SOHMIDBORN.

SPEED ADJUSTER FOR MOTION PICTURE MACHINES.

. APPLICATION FILED JULY 29, 1913.

1,128,460. I PatentedFebQlQlQlb.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

WILLIAM P. KUBI'IZ AND CHARLES SCHMIDBORN, OF ST. LOUIS, MISSOURI; SAIDKUBITZ ASSIGNOR TO SAID SCHMIDBORN.

SPEED-ADJUSTER FOR MOTION-PICTURE MACHINES.

Specification of Letters Patent.

Patented Feb. 16, 1915.

Application filed July 29, 1913. Serial No. 781,878.

To all whom it may concern:

Be it known that .we, VILLIAM P1111111 Kixnrrz and CHARLES SGHMIDBORN,citizens of the United States, residing at St. Louis, in the State ofMissouri, have invented new and useful Improvements in Speed-Adjustersfor Motion-Picture Machines, of which the following is a specification.

The invent-ion relates to motion picture apparatus, and has for anobject to provide a device for adjusting or controlling the speed ofmotion picture machines.

The invention comprehends, among other features, the provision of asimple and eliicient device whereby the speed of motion picture machinescan be so regulated and controlled as to govern the advancementof thefilm as it passes through the machine and whereby, when desirable. themotion picture apparatus can be. brought to a stationary positionwithout, however, interfering with the main drive or motor by means ofwhich a motion picture machine is normally operated.

1n the further disclosure of the invention reference is to be had to theaccompanying drawings, constituting a part of this specification, inwhich similar characters of reference denote corresponding parts in allthe views, and in which:

Figure 1 is a side elevation of our device; .Fig. 2 is plan view; Fig. 3is a vertical transverse sectional view taken on the line 33 in Fig. 1;Fig. l is a fragmentary vertical sectional view taken on the line M inFig. 1; Fig. 5 is a fragmentary vertical longitudinal sectional viewtaken on the line 5.5 in Fig. 2; and Fig. 6 is a vertical transversesectional view taken on the line 66 in Fig. 1.

Referring more particularly to the views, we disclose a motor 10 havinga main driving shaft 11 journaled in uprights 1'2, between which isarranged a cone pulley 13 carried on the shaft 11, a similar butreversed cone pulley 1-1 being interposed between the uprights 12 andcarried on a shaft 15 journaled in the uprights. Keyed against rotationon the shaft 15 and slidable longitudinally on the shaft is a wormmember 16 meshing with a worm gear 17 having con- 7 nection with amotion picture machine 18 on the shaft 15 and the worm member 16 isinterposed between its ends, with journal boxes 20 of the member 19abutting against the ends of the worm member 16 so that when the member19 is actuated the worm member 16 can be moved longitudinally on theshaft without, however, preventing its rotation with the shaft, as willbe readily understood by referring to the views. For the purpose ofactuating the member 19 a lever "1'1 has pivotal connection with abracket 22 projecting from one of the uprights 12 and the said lever 21has a pinand slot connection 23 with the member 19.

In order to transmit motion from the cone pulley 13 to the cone pulley14 a threaded spindle 24 is journaled on the up rights 12 to lie betweenthe uprights and between the cone pulleys 13 and 1 1. A thimble isthreaded on the spindle 24 and carries a nut 26, a wheel 27 beingarranged to rotate on the thimble 25 and held thereon by a flange 28 atone end of the 'thimble and the nut 26 at the other end thereof, withthe said wheel 27 operating over the surfaces of the cone pulleys 13 and11 so that when the cone pulley 13 is rotated, rotation will be impartedto the cone pulley 14. Now it will be understood that the spindle 2 1 isnormally stationary, and,

if it is desired to adjust the position of the wheel 2'7 with respect tothe cone pulleys 13 and 14c to result in an increase or decrease ofspeed of the cone pulley let, it will be apparent that this can beaccomplished by turning the spindle 24, thus advancing or retreating thethimble 25 on the spindle to change the position of the wheel withrespect to the cone pulleys. A semi-circular brake member 29 preferablyformed of fiber or the like has rigid connection with the bracket 22 andprojects therefrom, with the said brake member lying adjacent to theworm member 16 and'normally spaced therefrom. The worm member isprovided at one end with a circular. tapering recess 30, into which thebrake member 29 is adapted to extend and frictionally engage the wallsof the recess when the worm member 16 is moved toward the brake memberby means of the lever 21. Now it will be apparent that when the deviceis in operation, if it is desired to reduce the speed of the gear 17,thus reducing the speed of a motion picture machine 18, a pull isexerted on the lever 21 to move the worm mem ber 16 into engagement withthe brake member 29, thus resulting in the brake member exerting africtional braking action upon the Worm member and therefore reducingthe speed of rotation of the shaft 15.

In order to properly secure the Wheel 27 in any desired positionandprevent accidental advancement of the wheel upon the spindle 24, a foot31, projects from the thimble 25 and is adapted to operate in a guideway32 so that when the wheel 27 is rotated through the medium of the conepulley 13 the spindle 25 will be prevented from accidental advancementalong the spindle 24.

It will be understood that we do not limit ourselves to the particularconstruction disclosed therein; that various departures may be made fromthe construction disclosed without departing from the spirit of theinvention and that' the scope of the invention is defined by theappended claims.

Having thus described our invention, we claim: I

1. In a speed adjuster for motion picture machines, the combination witha shaft, of

a worm member mounted to slide and to turn thereon, a worm gear meshingwith the worm member and having connection with the motion picturemachine, means for impartmg rotation to the said shaft, a

U-shaped member mounted to slide on the shaft and having the worm memberlying between its enC :2 lever having connection with the said memberfor actuating the same on the shaft to advance or retreat the wormmember on the shaft, and a brake member adapted to be engaged by theworm member to exert a braking action thereon.

2. In a speed adjuster for motion picture machines, the combination witha shaft, of means for imparting rotation thereto, a Worm member mountedto turn and to slide on the shaft, a U-shaped member mounted to slide onthe shaft and engaging the worm member to advance or retreat the same onthe shaft, a lever for actuating the said member and having a pin andslot connection therewith, and a brake member adapted to be received ina recess formed in the worm member to exert a braking action on the wormmember.

In testimony whereof we aflix our signatures in presence of twoWitnesses.

' WILL P. KUBITZ.

CHARLES SCHMIDBORN. Witnesses:

WILLIAM C. PERKINS, J osnrn M. CHISWELL.

